Senator Mike Lee, who chairs the Senate’s antitrust panel, will conduct a “preliminary inquiry” into whether conversations Google had with FTC investigators influenced the commission’s decision to clear the company of anti-competitive behavior, reports the WSJ.

The senator could later expand his inquiry to include conversations people in the White House had with the FTC and Google, people in his office said.

The FTC last week denied that its decision had been “a close call” following leaked documents suggesting that it had been. The documents also provided some fascinating insights into Google’s business model.

Google declined to comment on this latest development, but has previously said that its meetings in the White House were not related to the FTC investigation.